Can I use ultimate seo urls and Ceon URI Mapping together?

Can I use ultimate seo urls and Ceon URI Mapping together? They both have something I want. Ceon URI Mapping is difficult to use when I want to rewrite other pages like reviews contact us and news articles. That is easy for ultimate seo urls. But the problem of ultimate seo urls is that there's always a number in the url and they can not rewrite categories url as xx.com/xx/. It will be xx.com/xxx-1.html. That's not perfect for seoer. SO I'm here to ask for help that if I can use them together. Will there be any conflict or I should try it myelf first?:D

If it is possible to use them together (which I highly doubt) you would need to be expert in their application to integrate them. The number added is as you say irrelevant to people and to search engines, and the .html is misleading fluff that only makes the URL less pretty.

These modules have absolutely no influence on "SEO", or your "ranking" on Google.

However, some people think that "pretty URL's" have a marketing advantage (though I have been in marketing for 30 years), but there is also no hard evidence to support this.

If you want to change the URL's then use ONLY Ceon's Module. All the others are very risky.