It should be nearly the same, and since they share A5 chips (albeit the iPod chips will have a few improvements over the iPads) they should have the same RAM.
If you want a more direct idea of what it'll be like, try messing with a 4S for a while, since they share the most spec wise.
However there must be some differences as they don't give Siri to ipad2 but do give it to the ipod touh 5g?
well I will say this I have a IPod touch 5g myself And one of my teachers uses iPad 2nd generations in the classroom. I have messed around with the iPad and it crashes a lot. The iPod on the other hand will not freeze up on you. The iPod has a 5mp back and a 1.2 mp front camera. the iPad has around a 1mp back and VGA front camera. The iPod has Siri enabled. The iPod has a retina display while the iPad 2 doesnt. Now the disadvantages to the iPod are small. The iPod has a 1136x640 resolution and the iPad has a 1024x768 resolution. (kind of tied on resolutions.) The other thing is the iPad's processor is the full dual core 1ghz while the iPod is underclocked to 800mhz but there's not much of a diff. I say the iPod touch 5g is your best bet
However there must be some differences as they don't give Siri to ipad2 but do give it to the ipod touh 5g?