Ok to alternate Radiesse & Sculptra for crepey arms?

55 yo, 5'2, 110 lbs. I have crepey arms and some loose skin from a 10 lb weight loss. not wanting brachioplasty. Per NIH study: Radiesse gives more immediate results but I know it doesn't last as long as Sculptra. Since they target different types of collagen and the radiesse is injected deeper than Sculptra, could I get get them both, alternating by about 4 weeks between each? (am also doing rf microneedling).