etiquette - My paper's content is slightly changed from the abstract I have submitted to a conference, can I edit the accepted abstract on my poster?

I'm fairly early on in my PhD research. A few months ago I submitted an abstract to a conference, which was accepted. The conference is coming up soon, and my research has taken a slight turn away from my accepted abstract (still same field, collaborators, etc...--just asking slightly different questions and taking a slightly different approach).

My question is, am I obligated to put the program-accepted abstract on my poster? If I am, should I try to tie my poster content as closely to that accepted abstract as possible? Or can I present poster content that would've been more appropriate for a different abstract?

Or can I use a different abstract on my poster, and thus tie the content more closely to what my current research path is?

What about keeping the original abstract in its entirely, but appending it?

EDIT: I'm in the field of astrobiology (probably most similar to the fields of geology or astronomy if I had to relate it to a more conventional field)