The engine cases are the same, so the engine will fit. Primary difference from Brutale to F4 is in torque output vs HP...F4 is higher rpm/HP compared to Brutale.
Gearbox and primary ratios may be different. Cams probably but not the head itself (I don't think). Look at valve size for a clue there..
I used to be fast....now I just dream about it.
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'08 910R (Gina), '04 F4 SPR #275 Track Bike (Lola), YSR50 (The Rabbit), '71 CB100 (Lil' Red), '75 RD350C (Orange Bird) restoration project, '70 Suzuki F50 (Baby Blue)