I did it a long time back, before I’d built a wheel (though I did have the feel for truing/tensioning).
Just tape the new one alongside the old one in the same orientation, transfer the spokes and evenly tension them afterwards. Get them all to the same tension as best you can (easy if it’s all straight, just do the same thing to all of them on each aide), true it a bit, then spread the tension by finding spokes which ring a higher/lower pitch than their neighbours and spreading that discrepancy either side (on the same side, obvs).
Should be relatively easy.