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CC2530天线差分转单端电路的疑问

Other Parts Discussed in Thread: CC2530

在规格书上,RFN(26脚)经过18pF电容后接2.0nH电感到地:

而在CC2530 With Skyworks’ SE2431L Range Extender Front参考设计上,RFN(26脚)经过18pF电容后接的确实1pF电容到地:

我的疑问是:2.0nH和1pF的电容位置是可以随意调换的?如果不是,什么情况用电感接地的电路?又什么情况用电容到地的电路呢?