My web application used to generate not so SEO friendly urls. They used to be like this:
(And no this is not a search result page. This url is generated only when a user is clicked a particular category link )
Now after doing some enhancements I am able to make the link generate a somewhat SEO friendly url as follows:
And now I am being asked to redirect old url to this new url instead of sending the old one to 404. I asked a SEO specialist if this right? He said "This is totally wrong, your website might get penalised for doing this". Is he right?