Same as the non-Turbo MD22: If it has a belt driven seawater pump, it's a -B revision. If it is directly mounted on the camshaft instead, it's the -A revision. Probably they didn't know they were going to make a -B yet, so there is no revision on yours, indicating it's the original -A
The MD22 and its derivatives, the fuel filter primary is usually the CAV296 type and the engine mounted one is the same throughout the range iirc, Ive just done a quick check on marinepartseurope and its the one ending in 740. The oil filters do differ with the thread size being the difference. The original one directly derived from the Maestro engine and the Perkins engine having a bigger thread. The turbo charged engines have a subtly different compression ratio and the timing marks take that in to account. The difference in power output is taken care of with the pump adjustments, not a different pump per se. The speed and pump settings give different power outputs, my 50hp version only revs to 3200 but the car one used to rev a lot higher and I think that the higher powered versions including the turbo ran at higher revs to achieve that.