It can not be denied, that the Pakistani solid fuel rockets Ghaznavi and Shaheen-1 are similar to the Chinese DF-11 missile type.
On photos is recognizable, that the Chinese DF-11 and DF-11A by set of some solid fuel segments are built.The DF-11 uses two segments. For the DF-11A is a third segment added.
For the Pakistani Shaheen-1 is a further half segment added. All rocket types have the same diameter of 0.88 m. The Shaheen-1 have however a striking extended skirt in the nozzle area, because the missile has another control system and a larger nozzle (?).

On photos is clearly recognizable, that also the Chinese DF-15 and DF-15A by set of several short solid fuel segments are built. Four segments uses the DF-15, and the extended DF-15A uses five segments. All rockets have a diameter of ~1.10 m. The DF-15 missile type is obviously not exported.

Unknown are the Chinese rocket variants M-9 and M-18. They are referred as export variants. So is suspected that the Pakistani Shaheen-1 corresponds to the M-9. The M-18 probably corresponds to the Pakistani Shaheen-2. The Chinese M-18 was allegedly shown at the 1987 Beijing air show. Now I have found Photos of the M-18 missile ! (see below)

The Shaheen-2 is totally different to the DF-11 and DF-15 missile types. The diameter is significantly 1.40 m. China Hexi Chemical & Mechanical Company presents solid motors for first stages with the name L-SpaB. Very capable for the Shaheen-2 is an engine L-SpaB-140B with 1.40 m in diameter and a length of 7.15 m. For the second stage is a shorter solid motor SpaB-140 capable.

It is also not known whether the Iran from China have bought M-9 or M-18 missiles. This is unlikely. The new Iranian Sejil (syn. Ashura, Ghadr 110) missile is not of Chinese origin. It has presumably a relationship to older  Soviet technology (e.g. OKB Fakel 5Ya27 ABM). It is not known that China have builded solid rockets with a diameter of 1.25 m.
 

Nozzle comparison

DF-15/DF-11