Yes and no. I'll presume youre playing the same game on either platform cause how optimised the game itself is could factor in. Also presume you tried other comments solutions.

60fps is 60fps but there are factors to consider. As mentioned, consistency of frames but also, since you mentioned it's on pc you find the issues, it might be worth checking likes of gpu usage and RAM.

[Game bar might be helpful- Quick way to check in game, if you press and hold the windows key and then press the 'G' key, it'll open Xbox game bar (alot of useful features if you want to play with them a bit). The bottom left corner will show gpu, ram, vram etc. Clicking on the settings of it you can change location to a bar and shrink it so it just shows numbers, then pin it. It'll stay on screen if you do that even after leaving game bar. When you do that and go into the game, it will continue to show values in percentage. If anything is very high, it will affect your gameplay.]

Likes of cpu and gpu, you will want around 80 or 90% at least depending on graphics card. Close to 100% in any of them will cause issues for everything. If your ram is too high, close apps in the background, especially likes of chrome tabs. If it's gpu, turn down the graphics a little. If it's vram, turn down graphics a bit, ideally texture related. You could also try reducing the room temperature as a PC running hot will have some issues.

Realistically, 60fps is still 60fps so these solutions aren't demanding, you don't need to go from ultra settings to low, even lowering shadow quality a little is likely enough. Another thing that could affect it is you're trying to play a game with an older gpu so performance in general won't be insane especially considering the ps5 has a pretty damn good graphics card and alot of PC users use a lower performance one. A better gpu will manage poorly optimized games better obviously but games like fortnite are extremely well optimized.

TL:DR - Close background apps, lower graphics a little and keep the PC cool. Any further help, just ask and I'll try :) hope the issue gets resolved.