I agree with Harold no reason for cartridge to leak just remove the cartridge one more time turn on the water for a few seconds to flush all the debris out, inspect the inside of the valve with a torch for any scratch clean the cartridge use some silicon gel install and see, Thanks.

John

Those cartridges are NOT really similar in any way that I can see... look close. I'm amazed that you got the new cartridge in place at all!

Moen will send the correct cartridge and you should be all set!

Good luck!

Mark

Got the new cartridge from Moen within 4 days and BOOM all better :) Thanks for all your help all!!