The B19/21/23 family heads and B200/B230 heads can be swapped over however the timing belt covers will not swap over
I would rebuild the B21 complete but add the sensors for LH2.4 to the head. You also need to drill and tap the back of the block for the crank sensor
For info and to be clear the B200F should not have piston oil sprays. Not saying impossible but I have never seen one or any data to suggest they might have even been fitted with them. Only late turbo engines had them
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