Upvote:-2
It can be the same but does not need to be
Upvote:1
(Hi), there seem to be an inconsistency with your title and the actual content of your question, but I believe that what you are trying to ask is whether or not the guarantor should also be the inviter.
The short answer is "No". The long answer is "No, but I believe that the invitee (person being invited) or applicant will have a higher chance of getting his/her application approved if the guarantor is also the inviter."
The reason for the long answer is because, the applicant needs to submit an Invitation Letter from the Guarantor in Japan. See the complete list of requirements for Visiting Relatives visa. If the inviter is the Gurantor, it means that s/he guarantees that the applicant is of good moral character, does not plan to overstay, etc. and in some cases also plan to shoulder part or all of the applicant's travel expenses.
You can get more information on Japanese visas from the website of the Embassy of Japan in the Philippines.