It appears that the speaker wire on the L90RL is removed merely by pulling it out while the P90 needs a tool (or paper clip) to remove the wire. Wondering if a Cshell with a wire designed for the L90RL can be used with the P90. I have an extra set of cshells that I got with the L90RL but thinking about picking up a set of P90’s as a backup.
Yes, they are interchangeable
Do this speaker wires come w/ receiver on them? Reason I ask is my Audi is mailing me shorter wires - she didn’t have that size on hand - She showed me that o could pull wire out but didn’t mention anything about other end. I figured I’d wait to get them, but since your post came up (good timing) I thiugyt id ask. 
I would reply to your question but it requires at least 20 charters … and “yes” it to short
Sorry, I can’t answer your questions. When I purchased my aids from zip, my audi suggested I get a second set of earmolds so I would have them in case the first had a problem. Both sets of cShell from Phonak have receivers installed in the molds. In my case, yes but I am not sure about others. In my case it made sense because ZipHearing had a good price for the molds.
Both are removed by pushing out the pin near the wire/body junction. Dont have to push the pin all the way out, just a bit. Both receivers have 3 pins and are known as the 4.0 receivers.
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Thanks for the response