You can sweat them, but to do it you're going to have to get the male adapters out, clean off any teflon tape and/or pipe dope, clean & flux the adapters and screw them back in....then solder it up after removing the cartridge from the faucet. I usually solder everything on a tub/shower faucet just so I risk having a threaded joint leak after everything is said and done.
good luck





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