It'll depend on a few things

Soil type - soil type will determine root ball size. Loose and sandy soils allow for larger rootballs. Rich soil should lead to a smaller root ball and easier recovery after transplant
Tree spade size - obviously a larger tree spade will not impact the roots as much as a smaller one
Timing - those cedars are just coming out of dormancy now, probably not the easiest time to transplant them

Cedars grow fast to start out, I would only move the smallest ones available

What do these cedars look like now? They vary so much from location to location. My old growth thick forest cedars on our property are very tall and spry where as ditch cedars or sandy soil cedars are short and stumpy with more girth. They also grow upward at very different rates - with lots of room they will grow out just as fast as up - confined to a heavily wooded area, they grow tall very fast and stay slender. Moving these between environments isn't going to work

Cedars are pretty hearty - i've had a few choked out with Virginia creeper vines that were near death and completely bounced back after removing the vines

Mat Peirce
1.25 acre southeast Iowa pond
LMB, BG, YP, WE, HSB, RES, BCP