Shaheen is probably similar height of Olivier, or a little taller - first thing he needs to find the ideal length that can hit the bail, other wise he'll go for plenty.
I can recall one interesting story - in his first tour to AUS (1976), Imran got a flier at MCG and he tried to impress DK Lillee ...... it went for 0-115 in like 23 overs

, and same Test DK took a 10 for. After 1st innings, Lillee called Khan for a chat and explained him what error he was making (which is very common for most Asian pacers in AUS, may be apart from Kapil & Wasim). Imran listened, every word without ever interrupting ..... next 3 innings in that Series was 5/122, 6/102, 6/63 .....
Oblate, PAK youngsters are more in Shehzad mold than Imran mold - talks more than listening