Slitherine

when reinforcing prestige points does the cost amount depend solely on the experience or the type of unit being reinforced? for example does it cost more to reinforce a tank vs an fighter unit to its full strength if they have same exp?

The cost to reinforce a unit depends on prestige cost, and whether they are elite or green replacements.
During the Deployment phase each point of reinforcement cost one tenth of the base cost of the unit.
For Infantry it is one fifteenth. The cost of transports is added to base cost.

From Rules.json:
"replenish_cost_elite_deployment" : 100,
"replenish_cost_elite_mission" : 150,
"replenish_cost_regular_deployment" : 50,
"replenish_cost_regular_mission" : 80,
. . .

Type of unit makes no difference.