Japanese version left, USA version right. The difference is the bell on Pika's hat. The Japanese version has a bell, the USA version removed it.
Japanese version
USA version.
The funny thing about the USA tags for all three plush is that it kept the Japanese artwork, which included the bell that was actually removed on the USA version plush.
Japanese version left, USA version right. The difference is the bell on Vulpix's cape. The Japanese version has a bell, the USA version removed it.
Japanese version
USA version
Japanese version left, USA version right. The difference is the bell on Rockruff's ribbon. The Japanese version has a bell, the USA version removed it.
Japanese version
USA version