Whoever signs for him has changed their writing over the years. Some years ago, his mother June was responding to all of his fanmail, and that does not look like the writing from back then. Maybe he has a new assistant.
By the way, I do like the second photo of him.

They are FAKE Sec Signatures !!!
I got the same FAKE Autographs .
I sent mine to PSA to get them Authenticated .
It cost me over $50 . they came back saying they were FAKE :(

Hi MWinick :)

Thank you for your feedback {up} Great Success :P

You have been added to the list for the $10 gift certificate.

{star} [url=http://www.fanmail.biz/1615.html]John Travolta[/url] on Fanmail.biz | [url=http://www.fanmail.biz/feedback/John_Travolta.html]Previous Feedback(s) Received[/url]

Fanmail 8)

On 2/13/2017 I mailed a letter explaining how I find Mr. Travolta's work with his activism to be very inspiring to me, a birthday card wishing him a Happy Birthday for February 18th including $5 donation, and an SASE Envelope to:

Mr. John Travolta
PO Box 410
North Hollywood, CA 91603

(took about 4 weeks)

Received two pictures of him personalized to me on 3/10/2017

Here is the link: http://mwinick.blogspot.com/2017/03/mr-john-travolta.html