The uTube video below, is someone trying to make a Katana sound like a Fender amp and does a good job. He makes his patch file for Katana free to download on uTube link.
Most amps have a Preamp and tone stack curve which shapes the sound of the amp amongst other things. Fender and Vox have this mid scooped feature in the preamp depending on where tone controls are adjusted. Grab a copy of Duncan Amp Tools software and see this in graph form for yourself. I went through this sort of process in designing my latest Shads Tones for the Katana. I created patches for the main sounds used over the early Shads tunes. By making adjustments to the global eq settings on the Katana, you can shape the sound to match the amp quite well.
You can then after getting the Katana sounding more like a Vox , make EQ adjustments in the effects section and use compression and boosters to get the right tones, The room reverb is great with some pre delay and if course Tape echos an be employed. I prefer to use a dedicated external echo though, as this frees up effects on the Katana for the other effects.
https://youtu.be/SDPcC1MmkQ06