Usage for two sites (google adwords)? Does it affect SEO (affiliates)?

Question

Search Engine Optimization

Hello! There are 2 sites of one company, 1 - domain com.ua | 2 - standard domain that issues prom.ua - prom.ua.
The main site com.ua - work is underway on SEO + contest advertising. No work is being done on the site on prom.ua, just advertising on the site itself. Now we decided to launch google adwords advertising for the site on prom.ua.
1. Question - do I need to create a new Google Adwords account for prom.ua or can I use the one on the main site that is advertised (they say that one account is one domain)? If the same adwords account is used, will it not affect the SEO of the main site (I mean affiliate sites)?
Can you give any other advice?