Yep. The Wundernine, aka 9mm Parabellum, aka 9x19, is .355. It also has a tapered case. The 9mm Makaraov, aka 9x18, is .365 (mas o menos, depending on who's making the gun), and is a straight-wall case.
Conclusion: don't do it.
cf. Wikipedia article: "Although the nominal calibre was 9.0mm, the actual bullet was 9.3mm in diameter, being shorter and wider and thus incompatible with pistols chambered for 9x19mm Parabellum cartridges."