Since red Kool-Aid blue Kool-Aid both taste like bitter almonds, yeah, there's no difference. And that's been the case for at least a couple of decades.
I believe the problem is over-reach, or at least one of them. Any time one or the other groups is in "power", the over reach starts.
If we look at the Republican side When in power, the reach is to become more conservative. This will continue until the populous has had enough. When you start talking about cutting out SS or Medicare, and doing silly stuff to your voter base like that, you end up losing support. In my state, there was an attempt to recall judges for not thinking right, so to speak. It failed. Attempts to remodel the judicial system with a bunch of Karl Roland Freislers was classic overreach. We've seen this in the past with attempts to eliminate teaching Evolution in schools, and replace it with young earth creationism taught as science. Just two examples of conservatism gone bad. Compounded by Republicans going batshit crazy after O'Blama was elected, then insane when he was re-elected.
On the other hand Democrats are not immune from overreach idiocy either. After Trump was elected, many had the same reaction as Republicans had with O'Blama. They did some strange things, like take up anti-science and anti-biology positions, they abandoned core demographics like Unions and the resulting workforce union adjacent demographic, they supported schools superseding family authority, moved to getting marching orders from a small group of far left wing academics, then were surprised when the demographic they had spent years dehumanizing - males in general, and young males in particular didn't vote for them. A worrying thing, since males tend to become more conservative as they age.
I'm certain I pissed everyone off, which is another core overreach of the present system. Whatever you believe, the other side hates you and wants you to fuck off and die. I get most of my vitriol from the left wingers lately, but I can piss off the far right just as easily.