Government amounts appear in the current USCIS fee schedule, Form G-1055, and vary with the route used. State licensure, credential verification and examination costs are separate and typically exceed them.
Ask which line the employer actually pays
Hypothetical example: the group offers to cover immigration costs, and the veterinarian assumes that includes licensing. It rarely does unless it is written down. Ask for the reimbursement policy in writing and check what it names: government amounts per the current G-1055 schedule for the route chosen; premium processing if a petition is filed and the timeline requires it; the state board's application charge; credential verification through whichever service the board designates; examination or jurisprudence requirements; and professional liability insurance in the new jurisdiction.
Then the personal costs: certified copies, courier charges, travel to the port of entry, temporary accommodation, and the gap between the last Picture Butte pay period and the first American one. Verify current amounts from the fee schedule rather than from an older summary.