Same media different format

[DeanoVIP]

Apologies probably a really simple one, if you have the same media but one is 1080p and the other 4k.  How do I organise these, do I place both media files in the same folder so I can choose which one to play depending on the device being used?  Do I need to name them in a certain way, currently I do:

Folder - Title (date)

Files - Title - year - resolution.mkv  

Does this confuse anything when subtitles come into play, lets say one is .mp4 with a separate .srt file and the other is MKV with them baked in?

Thanks almighty Jellyfin Guru's!