The only vehicles I have from both Italeri and Rubicon are the Panther and Tiger I . They are about as close as your going to get having 2 different companies making them . Even in 1/35 scale a Tiger by one company will have tiny size differences in various parts from the other half dozen companies making a Tiger kit . Italeri kits on left , Rubicon on right
Rubicon top, Italeri bottom
In the overhead view of the Tigers , you can see the Italeri turret has thicker sides than the Rubicon kit , thus making the turret 2mm wider , is that going to be a deal breaker ? Personally in this scale if the vehicle is close in length , width and height bu 1 or 2mm its good enough for me . Obviously something 1/2 inch too long or wide will be rejected unless it's the only game in town ( in plastic ) .For example , I found a 1/48 scale plastic T-70 tank model kit by Micro - Mir which I ordered out of the Ukraine . Until someone makes one in 1/56, this one looks like a winner to me . Hasn't arrived as yet , but kit dimensions make it a little smaller tha my 251 half tracks which the real thing was IRC . They also make a T-80 tank and a T-90 which is the 70 with a twin .12.7mm machine gun AA turret , so if this kit looks the part , I'm ordering a few more