Fuel Pressure Regulators, Compatability?!

[welshpug 1,657]

are gti6 and Mi16 pressure regulators compatible?

 

they look the same and have the same pressure written on them, they fit in the ame way, but when I swapped the Mi into the gti6 rail fuel just pissed out past it! is it just that the seals are so old that they're knackered? as it was a damn struggle to pull it our, and I think i may have damaged it as its now dented

[welshpug 1,657]

managed to find that the Mi is 1985 05, and Peugeot want £60.70p inc vat non-trade! anyone know the part no for tehgti6 one?