Antenna difference and raccomanded layout

Note that the device is certified only with the AH316M245001 antenna.
to further answer the questions.
Since I can see any from datasheet, which difference have this two type of antenna in certifications and performance?
[Prajay] These antenna have more or less the same performance. The RFANT5220110A2T requires a larger ground clearance compared to the AH316M but its layout is a bit more easier to implement.
- On RFANT5220110A2T datasheet there is no specified matching components. It's normal? So I don't need to add any antenna components?
[Prajay] It is recommended to add a 3 element matching network (PI or T network) so that any board level impedance variations can be tuned out. For a perfectly built board there may not be a need for matching network, but that is a very rare case.
- On AH316M245001-T datasheet there is a void but with no specified min. and max. void dimensions, where I can find them?
[Prajay] For the AH316M the void dimension is exact. You cannot change this. I am attaching the design guide here.
- In the case of AH316M245001-T I've placed CC3100 in the corner of pcb and I have limited RF wire length, I've calculated wire width to match 50ohm. Since I can't find any min. RF wire lenght, can be good a layout like this? (rectangle is the void, I'll position it better and eliminate vias inside it)
[Prajay] Please follow the boosterpack antenna layout exactly. Especially the void and the feed points. Refer to the attached guide for details.
- In CPW-G what is raccomanded via size and distance between vias?
[Prajay] We generally recommend the via to be placed so that the distance between VIA to the trace is 3x the distance between trace to GND.
- Should I separate CPW-G Ground from any other components? (or can this improve performace?)
[Prajay] In general, the CPW-G can be shared with the board ground unless there are some high frequency noise from other circuits.

Design Guide AH316M245001_E20121105V2.1.pdf