Toca apps on 640? Won't load but work great on 928?

I have a Nokia 640 basically for my kids to use and it has worked great for the most part. One thing that has not though is several of the apps from Toca (Toca Kitchen, Hair, Town, ect...) The apps all work great on my 928 though. The 928 was a higher end phone when it was released but is much older than the 640. Could it just be that the 640 is not up to the task? Anyone know how the specs stack up between the two? Thanks

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