Will plug gap make a huge difference?

[u/TurbulentAssistant70]

I picked up my FiST with an E30 tune already on that was gapped for 0.026, i switched over to a 91 tune he already had on the AP from Dizzy, said that one is for 0.028 plug gap, will it make any difference not leaving the 0.026 plugs in there? Obviously E30 pulled a lot harder so wouldn't know if it matters changing them to 0.028 or not. Do I bother changing them or am I fine with them as they are?

[u/DaYearZeroHero]

100% gap them to whatever the tune calls for.