Hello John
It is very difficult to answer your question without doing some head scratching, the problem is that your 1:350 Russian warship could be a battleship, a missile cruiser or a fast patrol boat….all could be a 1:350 model but because of the difference in 'real world' size the parts such as hatches or ladders will have a wide variation in size.
The point that you make in your closing comment is usually the best way forward ….i.e. if it looks right then its ok.
I hope this helps.
Paul