Board Thread:Game Discussions/@comment-70.198.36.148-20170524011447/@comment-27862737-20170524063451

You can always contact Gree and ask (en-support@gree.net), but presumably not being able to fuse/combine them is intentional (I've seen other people mention it as well, but perhaps because these are "new" SF's that didn't previously exist.. not sure).

They may change that in the future, of course, and perhaps it's not intentional (maybe it's a bug), but unfortunately no one here would know. Only Gree would know for sure.

-M