Yes, you can move them over. As you don't need the Juwel black carbon sponge, put them there instead. Leave them there for a couple of months then remove them - if there's more than one cartridge, remove one, then a month later the next and so on till they're all gone.
mg/l calcium is not one of the units used in fish keeping so we need to convert it into the two units that are used.
57.6 mg/l calcium = 8dH and 144 ppm. It is at the top end of soft.
This is fine for tetras and cories but a bit on the low side for endlers. I would increase the numbers of tetrass and cories once you are sure the new tank has settled but don't get any more endlers. Though I assume you have at least 1 male and 1 female is you've found a baby so there will be more