They can bolt in if you have all the right stuff.

If the dak is a 500 and the ramcharger a 518 then the dipstick and tube are different and need to be kept with the trans.

There is an extra bolt hole on the dakota case where the front diff bracket bolts to the case, the dakota uses 2 bolts on that bracket, if you run the ram case you will have one of those two bolts missing, I don't think it is a big deal, I have done a few swaps with no issues so far.

The 500 is around 1/2 inch shorter, I have never had an issue just swapping them and letting the slip yolks make up the difference.

I have never run accross a spline count issue but I would never say never.

Also never having lived in the rust belt (thank the lord) I have never seen an issue rusting out dakota frames.