Like a lot of things, it depends...on which "F" engine you're mentioning.
The F0/1 had the same cam timing as in the K0-K5/6 bikes, 5 BTC intake opening, 35 ABC closing intake. In the F2 and all later ones the intake changed to 0 BTC intake opening and 40 ABC closing, which caused the powerband to shift upward (and narrow a bit) and required carbs with better-controlled idle circuits to prevent intake spitback troubles and resulting poor idling situations (especially when hot).
So, it depends on which "F" cam you get?
The F2/3 cams also had slightly more lift (almost 0.5mm more on intakes), which was part & parcel with the more-efficient intake valves of the F2/3 heads. I have approximated that same efficiency with the earlier valves (and the K7/8 versions) by trimming the lip off the faces, but this reduces their ability to resist rusting over time when sitting too long. The valves themselves don't swap, as the F2/3 valves use different retainers from the "K" versions (among other reasons). There are aftermarket solutions to some of these issues, but require large bankrolls to employ.