Maybe you can compare both and find some information from the following:

Activated weakly acidic alumina http://www.sigmaaldrich.com/catalog/product/sial/267740?lang=en®ion=TW

Aluminum oxide pore size 58 Å, ~150 mesh

particle size  ~150 mesh

pore size  58 Å

surface area  155 m2/g

pH  ~6.0 ( in H2O)

In the following paper, the main aspects to be taken into account when trying to improve the properties of γ-Al2O3 as a support for catalysts are reviewed.

γ-Alumina as a Support for Catalysts: A Review of Fundamental Aspects

Eur. J. Inorg. Chem. 2005, 3393–3403 DOI: 10.1002/ejic.200500348

γ-Alumina :

http://www.advancedmaterials.us/26R-0804UPG.htm

Yes you can, if the acidity and the surface area are the same, as I think both of them should be mesoporous . It also depend on the reaction 

if you want more information about the phases of alumina, you can find it in this article

http://www.sciencedirect.com/science/article/pii/S0926337312003918