oldlady
I think the better question is whether iScotland's spending priorities are likely to diverge over the long term. After all, separation is permanent. Clearly, impetus for left-wing policies has translated better into votes in Scotland than England (if taken as a whole). However, this has only been the case since the 1980s, and while 30 years is a long time, it's not as long as 300 years.
wanksock
Scotland was not in the same position as Norway in the 1970s. It had a large and ailing heavy industry sector. I reckon had Scotland become independent then, a lot of money would have been spent propping up the likes of UCS. There was plenty of impetus for propping up up these industries. It might have been spent on raising every tenement in Glasgow to the ground and replacing them with high rise schemes. We just don't know.
I'm not aware of the details of the present proposals, but I understand that in 1999, Holyrood was given the power to vary the rate of income tax levied by Westminster, with only Scotland taking the effect of the variance. For example, had Holyrood decided to increase the rate by 2p in the pound, the extra 2p raised would have been spent in Scotland. Similarly, had Holyrood lowered taxes by 2p, the shortfall would have affected Scotland only.
Possibly as a matter of administration, tax raised by Holyrood would go to the UK exchequer, but then get allocated as a block straight back to Scotland.