Yes just buy the part and fit.
But if you going to get someone to fit it get a plumber or someone who knows about showers.
See many that have been attempted to be fixed by clueless plumbers/handyman and been a total c*ckup.
The solenoid valve assembly on the original shower screw in to the bottom of the pump with an o ring seal.
The new valves have changed design and just push in with the original o ring/screws.
The pain in the ar*e bit is you have to unscrew half the shower internals to unscrew the old one.
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