Paulo, the Revell of Germany one is based on the outstanding Italeri Leopard 1A4. The Leo 1A4 is one of Italeri's best kits in fit, accuracy and detailing. The molds themselves are almost 20 years old. I do not know if RoG reworked the molds (unlikely) or made a new sprue with 1A1 parts to add to or replace on the Italeri kit (most likely).
Tamiya does make a Leo A1, but the kit is 30 yrs old and is not even close in quality to the Italeri Leo 1A4. That old kit was designed when Tamiya still motorized their kits and has all the normal motorization pitfalls. Interestingly though, if you are looking for a Leo 2, the new Tamiya kit is quantum leaps ahead of the Italeri Leo 2, which was one of their worst kits.
Eduard does make detail sets for the Leopards,
This is the one for the Tamiya Leo 1A4 (#35084), they also make one for the Italeri Leo 1A2 (#35338)
Great Models
http://www.greatmodels.com/ has the RoG Leo 1 A1A1-A1A4 on sale for $22.55 and the Eduard detail sets for $11.60 and $15.45 respectively.
Look for detail sets for the different Leopard 1s (A1, A1A1, A1A4, etc.) as they will have a lot of commonality of parts. Don't look for the detail sets for the Leopard II or 2 as they have little in common with the Leo 1 series of tanks.
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