local dipsensers = ents.FindByClass("prop_dynamic")

for k, entity in pairs(dipsensers) do
    if (entity:GetModel() == "model") then
        local position, angles = entity:GetPos(), entity:GetAngles()

        local dipsenser = ents.Create("your dipsenser")
        dipsenser:SetPos(position)
        dipsenser:SetAngles(angles)
        dipsenser:SetModel("the model")
        dipsenser:Spawn()

        entity:Remove()
    end
end