Shimano HG chain advice

Hi,
I have a 9 speed Shimano HG chain and have had some problems with a link being stiff and obviously the winter grime. So I removed it, soaked it in de-greaser and now it is lovely and clean.
My question is that do I have to use a special chain pin to reconnect the chain back up? What would happen if I just re-use the pin I have part removed?
I have a 9 speed Shimano HG chain and have had some problems with a link being stiff and obviously the winter grime. So I removed it, soaked it in de-greaser and now it is lovely and clean.
My question is that do I have to use a special chain pin to reconnect the chain back up? What would happen if I just re-use the pin I have part removed?
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