Pin-to-pin backward compatibility to Legacy Models of SiP module

•Trade the cost-effectiveness of changing and not changing the pin-count and pin-out after SiP schematic and/or its layout have upgraded
•The cost includes the re-layout and subsequent re-certification cost-up of system maker who uses that SiP module
•The effectiveness includes any of effectiveness-up of system maker who uses that SiP module, which are due to possible pin-count reduction, pin-out optimization, and the results in form-factor decreasing and easiness of trace/ground routing for either EMI immunity or RF performance enhancement