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I'd say that change of braking won't matter much. Changed FD will just move gears down a bit, so that more of them can be used to stay in powerband. You still won't overrev past redliine, and still probably will keep engine in effective powerband above low rpms, downshifting when needed, so roughly estimated braking from engine's pumping losses and friction at those similar rpm-s will be somewhat same, just at other gear. Yes, at some preset speeds you might be at different gear (that matched up with changed FD will provide somewhat same overall gearing) so slight difference in gearbox frictional losses & rear diff/fd frictional losses, and rpms at specific track locations may differ due different shifted gear switch locations but in general - difference meager enough to not care/bother.
Main bit one should care, if specific FD gearing for specific track layout will allow to accelerate faster due more usable gears and/or can reduce gear switches due more track coverable at some gears in optimum powerband, or if laptime will be lost due extra gear shifts needed, or they being at unfavorable places and such.
Track aside, for DD most favor FD change for NA power twins, enhancing acceleration/subjective feel of it, at some drop in fuel economy & increase in noise due higher rpm-s.
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