As mentioned, you can, but there's really no reason.
Leaving as is, allows the ability to switch back to your 36T cog if desired without having to add links back.
You might also consider you have 2" of extra chain to "share the wear".

I take my hybrid on vacation to much hillier terrain.
I leave my chain a bit extra long so I can swap on my "mountain" cassette and simply not have to bother with chain length when I do.