The contact patch is wider, assuming the right width wheel is used.. The width, ie: 295, is a cross-sectional measurement. The 295/35 is actually 1/2" wider (tread width) than the 296/45. The 35 requires a minimum of a 10" wheel, 11" is prefered. I ran the 35's on my 98 Vette which had a 18 x 9 1/2 rear wheel. It was pretty puckered...
Actually the difference is more pronounced... This was taken straight from BFG's tech info.....
295/35ZR18 SL 180 A A
1709lbs.
44psi
10/32nds
10-11.5"
10.5"
12" (cross section width)
10" (tread width)
25.9"
803
295/45ZR18 SL 180 A A
1819lbs.
44psi
10/32nds
9.5-11"
10"
11.9" (cross section width)
8.6" (tread width)
28.4"
732
A 295 is not a 295 which is not a 295.... When swapping to a different tire manufacturer and size ALWAYS check the mfr's specs before you change!