Help with improvement lua

[Padre19]

How do I check if the player who owns the improvement is the same as the player holding the unit......
in this lua code
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function PadreRadar(playerID, unitID)
local player = Players[playerID];
local iPromotionunuID = GameInfoTypes["PROMOTION_WATCH_TOWER"]

if player:IsAlive() then
local unit = player:GetUnitByID(unitID);
if (unit:GetDomainType() == DomainTypes.DOMAIN_LAND) or (unit:GetDomainType() == DomainTypes.DOMAIN_SEA) then
if unit:IsWithinDistanceOfImprovement(GameInfoTypes.IMPROVEMENT_WATCH_TOWER, 3) then

unit:SetHasPromotion(iPromotionunuID, true)
elseif not unit:IsWithinDistanceOfImprovement(GameInfoTypes.IMPROVEMENT_WATCH_TOWER, 3) then
unit:SetHasPromotion(iPromotionunuID, false)
end
end
end
end
GameEvents.UnitSetXY.Add(PadreRadar);