Does it matter which software used to create mobi?

I'm trying to prepare an ebook to upload to amazon. It's a collection of single panel cartoons, and fixed layout format seems appropriate. Started with Kindle Comic Creator, but couldnt do toc properly, and it was bugging me that KCC was overriding some files. Switched to Sigil, but still not good enough to my liking. Ended up writing html and epub from scratch, mostly based on the book by Paul Salvette (very good!), and it works.
Now, could Amazon give me trouble that Im not using Amazon-authorized software, eg KCC to create the mobi file?