Here are two coins that show how they can look so much alike but yet, be so different. I am just amazed at this and I discovered that I have two more Romulus and Remus with the she-wolf. They are from two different mints and that makes it even more exciting. Both coins are from the Time of Constantine. First is the coin from the Siscia Mint, a rare variety in RIC and rated as R5. Time of Constantine I and Sons. AE Follis, 2.3g, 19mm, 6h. Siscia Mint, 330-333 AD. Obverse: VRBS ROMA, helmeted bust of Roma wearing imperial mantle left. Reverse: She-wolf standing left, Romulus and Remus sucking beneath, two stars above, wreath between // RSIS. Reference: RIC VII 223, r5, p. 453 Next is the Trier Mint. Time of Constantine and Sons. AE Follis, 2.6g, 17mm, 12h. Trier Mint, 330-331 AD. Obverse: VRBS ROMA, helmeted bust of Roma wearing imperial mantle left. Reverse: She-wolf standing left with Romulus and Remus suckling beneath, two stars above // TRS• Reference: RIC VII 522, p.214, r4
Yes, they are very similar. During this period the same reverse types were minted in many different cities simultaneously. According to Victor Clark's Website on Commemoratives, this particular type was minted in 11 different cities.
Both very fine examples! Your Siscia coin appears to be RIC 222 (c3), not 223 (r5) as you state, the difference being that Roma on the obverse faces left on 222 but right on the rarer 223.