No b18 head is 2cm higher same with b16b=destroked b18c7 block.
Header wise depends on the header. If it is build specifically for a b16 then no.
But most headers are build for B18/16 to save costs, so you may get lucky
I had B16A headers from X-Force. Fitment-wise they were not 100% especially around the exhaust outlet ports. Gave the engine a very wide power band that made it lazy down low with little torque out of corners.
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