SHURFLO94-238-04 Diaphram Pump with Lower Housing Kit

Can you tell me the difference between you product 94-238-4 and the 94-238-03 kit which is the one I need

Does this pump and housing fit model # 2088-403-144 12 volt Rv pump

Will this fit model 2088 422 175 (a "special" Winnebago only number, but there is usually a replica with different number)?

Do these kits come with the pressure housing switch and the whole pump diaphragm assembly, just unscrew and replace onto motor, J.R.