What is the difference between a spice schematic and a mex shematic

[inassbouhichia]

Hi guys, 

I'm using the BFU730F to design a LNA, i downloaded the design kit but i see there's two types of the transistor, a spice schematic and a mex one. i tried both on ADS  but they give me different results. 

I was wondering if anyone knows what's the difference between both models and why i dont get the same results? 

Thank you in advance.

[LPP]

Please, these documents consider similarities and differences of Mextram and Spice model:
https://www.nxp.com/files-static/nxp/other_type/nlur2002823.pdf

https://www.nxp.com/files-static/nxp/other_type/bctm89graaff.pdf 

Have a great day,
Pavel

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