Discharge blackwater pjmp

[Todd Sevier]

Morning guys And boater ladies, my vacuum pump for my vacuflush toilet is getting older . I've done the duckbill valves a few times (dirty job), I have a brand new discharge pump and by looking at it , it looks the same . Can anybody tell me the difference. Can I use this pump instead of buying a new vacuum pump( I understand the configuration of duckbill valves my be different

 

[Pura Vida dos]

I believe you find reverse threads from one to the other, also vacuflush pump will have 4 duckbills, discharge pump will have 2.
Vacuflush pump black? Discharge pump white?