I perhaps said things wrong : but it's what i wanted to say in fact lol.
PES 2015-17 PC = PS3. I thinked that you were saying PES 15-17 PC=PS4, sorry for the misunderstanding
Well, only visual like i said, gameplay and animations, physics are the same. Perhaps less details too all around the pitch but for what i care.
It's not that important, with visuals mods, and as long as the overall game is the same to play...
I even preferred PES 2015 PS3 as you could've add kits, emblems, well option files. I remember worked on fakes teams on PS4 to makes kits lookalike.
IG it was okay, no joke, except ugly emblems of course. But while playing, it wasn't that bad. I extracted colors from the best created kits i remember, and toned down the kit's lighting as colors where too shiny on kits ig made.
The in game editor is the painfull one where you import, part by part templates, Front Kit, Backkit, right shoulder, left shoulder, Right shorts, left shorts, front socks, back socks. It is 8 parts imports, every 1 kit, i tell you so, cause i edit 2015 and 2016 by hand, and it is really painfull. AND you must edit the base kit, cause the colours are visible between images gaps, not only in equipment like next gen. It is a very time wasting process.
A good place to start if you want, that i used since 2016 is this for PC/PS3 kit templates. PESMASTER kit builder of course, now lets you to extract you kit desing to PS3 template.
https://emptyspaceskits.weebly.com/
Here is Arsenal for example,
https://emptyspaceskits.weebly.com/premier-league/arsenal-20-21-kits
As for performance comparison, i have both versions 2017 PS4 and PC. I feel PS4 version is slighty superior, except for the graphics part, it feelsm little smoother, i believed it was due to i play in medium/low settings, but
@Chris Davies did a face-to-face comparison crash test back then, i assume he has much better PC than me, and he concluded that PS4 has some better performance to response times, minor differences but you can feel it in the gamepad while playing.