Amp and PreAmp, stick to the same brand?

Hi, I’ am new here.
 l have just bought an Amplifier : McItosh Mc8702. I’have bought it used.
Now, I’am tinking of a PreAmp replacement for my home cinema system.
McIntosh Mx122 has some featers that I do not need : streaming for example.
I already have a good streamer.
I was thinking about Krell Foundation 4k as a potential PreAmp.
It is not possible to try the Krell at home with my equipement.
Marantz or Anthem crossed my mind too but they are less highend audio than McIntosh.
A friend of mine told me to never have an Amp and a PreAmp of two different brands.
Any tought  about that ?

Thanks