YES. Difference between them is very clear when playing music.
I'd say it is nearly as big difference between Air 2018 and entry Pro what you can hear in this review between entry Pro and "real" Pro.
https://forums.macrumors.com/threads/2019-13”-macbook-pro-showdown-1-4ghz-vs-2-4ghz.2190147/#post-27547279
In entry level Pro you don't get much bass and treble and also music does not sound as wide as in Air 2018. Entry Pro is more like emphasizing mid range, it is good for say FaceTime calls and such.
Have you actually tested both Air 2018 and entry Pro at home both on the same table side by side playing the same song at the same volume level and then switch between units by muting one and playing another?
I did and it was pretty evident that Air 2018 has better sound quality when playing music.
Anyway, I still ended up returning my Air 2018 and keeping entry Pro. I guess I wanted to have Pro model.

Also price difference between the two was not much in the end (I got very nice deal for entry Pro).
New entry Pro is not a bad machine but you obviously do not get the same quality level Pro as in higher priced versions, even the look identical outside. There are many small differences, like the display panel is not the same, speakers not the same, ssd is not the same (much slower, even slower than Air 2018), battery not the same (it will be interesting to see if this one is even rated for 1000 cycles as in other Pro's (I bet it is not, likely just 500 or 300)), also even the keyboards are supposed to be the same, typing feel is not as solid in entry machine (it is somehow hollow, hardy to describe but it is a little cheap feeling, even Air 2018 feels a little more solid).
I'm sure when more official reviews come out these differences became more pointed out.
It was also interesting to notice in practice that speed difference between Air 2018 and entry Pro in my normal daily use is not really evident in any way. I mean my usual task browsing web with multiple tabs open, email and such you do not notice any difference. I'm sure it will be quite huge when doing more CPU intensive tasks.
Screen is a little more neutral/natural than in Air and brighter if you need full brightness but normally I run it lower so no difference in real use. Also most differences are evident only running the two machines side by side.
Obviously LG panel in your "better" Pro. I've tried searching information about the FMX panel but no luck. I guess it is some of the cheaper new Chinese IPS like panel manufacturers. I'm not saying that is necessarily the bad thing but there are many questions that remain to be seen in the future. Also I think we will see in official reviews some differences found between this and Samsung/LG models used in better Pro. By they way, I have understood the IPS is LG trademark for this display tech and even Samsung has different name for it, PLS I think, and others too have their own naming for it. Just curious about all machines sold as IPS panel but they not all come with LG IPS, but that is what many other machine manufacturers do too, so I guess it is just common naming everyone like to use.
For example my Zenbook has IPS panel but it seems to be some BOE brand panel and while it is the most uniform LCD panel I have ever had (even little better than in my entry Pro in this regard, except BLB is better in my Pro virtually none), it has very nasty PWM flickering only at 200Hz but luckily I found a piece of software that allowed me to overclock it higher and my eyes were relieved (that 200Hz gave nice head aches). Also overclocking PWM causes audible high pitched noise that can be heard in quiet room.
Good thing with entry Pro is that it does seem to have much higher frequency PWM, so OK in that regard but obviously not very high bit color panels, has some evident banding when True Tone and/or night shift is engaged, is this possibly those 6+2bit often used in lower price range panels?
Also how is your entry Pro panel uniformity? I mean if you view it very critical and also testing with and without True Tone and/or night shift with fully white and gray full screen test patterns? In mine especially with True Tone and night shift both on it is very very slightly more red on left edge and slightly more bluish on right edge (especially lower left reddish and lower right cooler), but that difference is very small and you need to look it very carefully in dimly lit room. Not a really problem but panel is not perfect but I've seen and heard about the same problems and even much worse with LG panels.