Snap-ins have rectangular cross section pins that require 2.2mm diameter holes in the board, radial caps have round pins with less than half that diameter. (0.8 to 1mm)
You'd need to drill up the holes in the board if the caps there are radials, which should work on single sided pcb provided the solder pads are big enough for this.
If it's a double sided pcb with plated-thru holes then snap-in won't do. Drilling up the holes removes thru-plating.