If I submit these four images, will they be considered similar?

No, I do not think so. But if you want to avoid getting the same moderator, do not submit them together. Submit each of them on a different day. I would anyhow submit all assets spread over the days, like having 14 assets, submit 2 each day over a week. 

You need, however, to check your assets for artefacs and other errors.

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

I personally do not see a problem. But, like @daniellei4510 said, there is noway to know what the moderator determines. Alone here there is a difference of opinion.

An ocassional rejection due to similarity will not get you banned.

There's really no way to tell or read the minds of the moderators, nor can we be of much help in this regard. I've submitted as many as 9 to 12 "similar" images and all were accepted. I've yet to have images rejected on the grounds of being too "similar," but bear in mind that similar doesn't just apply to your own images but to all the images in Adobe's database. My main concern with these four images is not about similarities, but about their value in terms of being commercially viable. The only way to tell for sure is to submit them. I generally submit photorealistic AI images, so I'm far from being an expert when it comes to images of this nature.

Personally I find them similar, it is a question of perception that can be different from one person to another...

In clockwise order, 1 and 4 are quite similar.