Drywall fix doesn't match ceiling
Mudding is only one step in the repair process.

Patch repair, tape, Mud, Texture, Primer, Paint. 

Buy a can Homax spray texture and practice on piece of cardboard before doing the patched area. It is an acquired skill, make adjustments to the nozzle to get the matching texture size you need.

I usually start with a fine/small first, let that dry and then a medium on top of that.