Hey there. Welcome.
So would any guppy fry survive in your 20 gallon tank with its current setup? There is always a chance, but there are things you can do to increase your odds if your looking for that.
Keep your fish well fed, less need for them to hunt fry. Provide as much cover as you can for the fry, the better they can hide the better odds they survive.
Is your 10 galling tank setup already? Does it have any occupants? If you want to keep the fry it may be to your advantage to move the pregnant guppies into their own tank or the breeder box to protect the fry. Less fish to hunt the fry the better odds they survive. With many fish in a community tank setup there isn’t any guarantee the fry survive, just things you can do to help increase their odds