My advice is this. If you really want to compare components, do not quick swap and do not bother to painstakingly level match. Just use component A for at least 2 months. Then take it out and use component B in exactly the same way. You will not have any trouble deciding whether or not you have a preference. The last time I did this I actually listened to component B at a lower level than I normally listen to component A. Nevertheless, component A was packed and sold and will never be used by me again while I am keeping component B.
If you can in fact get comparable or better sound quality from component B over component A, simply by boosting the level half a dB, then you should just use the cheapest one. The difference is not worth paying money for, if all you need to do is up the volume a fraction.