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I assume they were both outland, they received a PPR/RFV titled to the primary applicant.
Oh, Ok. Bcoz, I'm the primary applicant & I'm inside Canada. I got the PPR request with my name on it, whereas my wife is in India. I replied to them mentioning I'm in Canada & requested them to provide PPR for my wife.

I received the P1 mail. When I called IRCC they asked me to send my wife's passport with my PPR letter. Can I use the PPR letter with my name on it for my wife's passport stamping?
 
Oh, Ok. Bcoz, I'm the primary applicant & I'm inside Canada. I got the PPR request with my name on it, whereas my wife is in India. I replied to them mentioning I'm in Canada & requested them to provide PPR for my wife.

I received the P1 mail. When I called IRCC they asked me to send my wife's passport with my PPR letter. Can I use the PPR letter with my name on it for my wife's passport stamping?
Yes you can