Hydrolic question rtv 900

Ok,after from being down an spset,spent, the score of my life,I'm not sure what's next.as I went to get a used head for my 04 rtv 900,I found a honey hole of engines an parts from a old friend, he gave me an entire new engine for the price of a head!!! So as I'm in the garage adding what I need before I swap motors, both motors are d902's ,mine is a 04 D 902e an the new one is a leftover only ran to check it but a 2019 d 902 e4....idk the difference.
I took off my mechanical pump an put it...

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Hydrolic question rtv 900