Pretty much. A guitar cab goes to 6khz and does not handle bass frequencies well. You are liable to blow the speakers with serious bass. Bass cabs like a Bergantino with mid driver or tweeters don’t sound particularly good with guitar.
The classic keyboard amp is a Twin Reverb, but that’s huge and very loud. A Fender Bassman is okay for recording volumes for bass.
The best traditional small combos are still probably Princeton and Deluxe Reverb, Ampeg Gemini.
Best modern combo with vintage sensibilities, Victoria and Friedman, and they make lower wattage heads. But expensive.
My recommendation is get a good guitar combo and get powered speakers. KH120as for instance. Don’t buy something cheap that does both poorly, only to later replace it.