Loaded 6.0, can I delete 5.4 Pro safely?

Can I safely move OmniGraffle Professional v5.4 to trash?

I’ve installed 6.0 a while ago and installed the Pro license. I still have Professional v5.4 installed. In my Applications folder, v6.0 is 46MB and v5.3 is 101MB.

Will removing 5.4 affect 6.0 libraries, settings, etc.?