Aye, but the chances of an X-4 being mounted on a ground attack aircraft would be slim. X-4s would have been mounted on the Dora series, Ta 152, Me 262 and later on the Ta 183.
Hell, even a Storch had X-4 capability... if they wanted it to.
p.s. The X-4 was an air-to-air missle not air-to-ground, ram.