Left footed/handed but lead with right foot on bike but left foot on snowboard. Have no problem riding switch on the board and getting the hang of it on the bike (i deliberately go for rides and lead with wrong foot – nothing extreme mind you – just trying to get it to feel more natural).
How can this possibly matter?
For just riding about it probably doesn’t. Switchbacks and steep corners it really does. Fast corners it does too – everyone have a favoured direction, for me i’m more comfortable turning left and hitting left handed hip jumps. Years of carving ramps and spinning airs/jumps on the bmx made me super confident going left. Airing right still feels weird and the first time i hit a big right hipped dirt jump i went straight on hit a tree. After half a dozen goes and failing each time i went and built a smaller right hip to practice on (with a right hand berm for good measure). Still feels odd but i don’t hit trees anymore, so it can matter.
Riding motorbikes is an slightly different one. Completely different technique and i still prefer fast lefthanders (on the track for the speed nazis 😛 ) but with so many roundabouts you get comfortable going both ways. So, you can retrain your brain somewhat and it can save your bacon so it can matter.
lol had to edit my post..i’m one of those people who struggle to tell left from right
double edit. On the subject of building stuff to practice on. My right foot is my lead when shoveling. Once i noticed this i made the effort to switch over. I’m convinced it helped me get the hang of carving/hipping right. A the twisting action maybe helped the muscle memory/strengthening thing?