I'd likely play them differently... especially on a table that tended to be a bit slow. (On a faster table, I'm a bit more likely to play them the same.)
In case #1, I favor playing the shot with low/right for one-rail shape ... targeting for whitey to end up 1.5 diamonds below center table and 2 diamonds this side of the 8... thereby providing me the cut angle to get back up river for the 9. If I get close to this position, getting back upriver is relatively easy. Also, experience has shown me that when I play this shot with high/inside on a slower table, that because of the powering-up effect, I'm likely to get too straight on the 8 to get back up river for the 9... or I could come up way short by over-spinning whitey.
On case #2, I'd definitely play high/inside 3-rail position (targeting for whitey to go through the true center of the table) to get down to the 9.