Hardly the same, the 13 Pro doesn't have a 48 pixel main camera, nor a lot of the other features, it's also quite a bit heavier, no always on display, no dynamic island to mention but a few.It sure will be: worse battery life, the rest is the same…
Having said that, is there enough in the 15 Pro to upgrade? Not for me.
The 13 Pro looks more premium and has a better battery life.
For me the premium polished look has to return whilst retaining the lightness and the camera bump has to disappear before I upgrade