Going back to an earlier question you posted and Jonathan commented on - notice the word used in the regulation is "should". The 37 CFR dealing with patent matters is littered with "should"s. Should means they'd like you to follow that instruction, but it has no force behind it. Still, I think most practitioners attempt to comply with all the "should" suggestions.
Just to add even more comfort: if the Office notices something they don't like, they'll typically give you an opportunity to fix it. Don't expect any such guidance until they actually look at your application -- i.e., when it's no longer "provisional".
While I don't know this for fact, I suspect the preferred EFS forms are scraped by machine for the pertinent information. So, they're processed faster and with less likelihood for human error. If you ever wished you could enter the application information into the Patent Office's database(s) yourself to make sure it's correct, using an approved EFS form is probably the closest you're going to get any time soon.
I don't think there'll be any probably with using the form you did. I just think it's easier to use the EFS forms when one's available for your particular need.
One last point re drawings: you'll be able to correct it as needed, but it's important that the details you need are clear in the Office's records. If you file by paper, they scan the documents, and not very well. Any photographic images (even screen captures) really ought to be included in a PDF by electronic conversion and filed electronically. Otherwise, some of the details in your images might not show well in the Office files (though maybe they still keep paper originals somewhere, but who knows if the examiner will look that up). Correcting (by supplying line drawings of the content of the images) might introduce new matter. At least that's something I worry about when filing by paper. Filing electronically gives them the same level of detail you see on your own monitor.
Regards.
