A far away place is considered, from Modiin,, a place near Yerushalayim, [30,000 cubits] and further and the same distance to all sides.

R’ Eliezer says from the threshold of the Bais Hamikdash’s courtyard.

Pesachim 9:3

With the pesach rishone [first] you are not allowed to have chometz and the second you could have chometz. With the first you need to say hallel when you eat it whereas the second does not need the saying of hallel.

Both need Hallel when you are making the korban, eaten with matzoh and marror and are brought on Shabbos .