Looking at your frames, the SIM900 outputs a PPP frame with HDLC
address and control bytes, while the SIM5216 does not.
I'm by no means a PPP expert, but just looking for PPP in wikipedia
shows this:
The Address and Control fields always have the value hex FF
(for "all stations") and hex 03 (for "unnumbered information"),
and can be omitted whenever PPP LCP
Address-and-Control-Field-Compression (ACFC) is negotiated.
You should actually check if that is the case before calling SimCom
tech support.
Besides that, those two HDLC-like framed PPP frames containing an
IPCP message are equivalent, you are being assigned an IP address
and provided primary + secondary DNS addresses
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