Holy Prophet has explicitly given physical descriptions of both Eesa bin Maryam (Jesus son of Mary) differently: the old one and the new one, in his Ahadith in Sahih Bukhari, Kitabul Anbiya.
Here’s the link for you to read online:
www.usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/055.sbt.html
Old Jesus son of Mary (A prophet towards Bani Israel) :
quote:
Volume 4, Book 55, Number 607:
Narrated Abu Huraira:
Allah’s Apostle said, "On the night of my Ascension to Heaven, I saw (the prophet) Moses who was a thin person with lank hair, looking like one of the men of the tribe of Shanua; and **I saw Jesus who was of average height with red face as if he had just come out of a bathroom. **And I resemble prophet Abraham more than any of his offspring does. Then I was given two cups, one containing milk and the other wine. Gabriel said, ‘Drink whichever you like.’ I took the milk and drank it. Gabriel said, ‘You have accepted what is natural, (True Religion i.e. Islam) and if you had taken the wine, your followers would have gone astray.’ "
Volume 4, Book 55, Number 608:
Narrated Ibn 'Abbas:
The Prophet said, “One should not say that I am better than Jonah (i.e. Yunus) bin Matta.” So, he mentioned his father Matta. The Prophet mentioned the night of his Ascension and said, “The prophet Moses was brown, a tall person as if from the people of the tribe of Shanu’a. **Jesus was a curly-haired man of moderate height.” **He also mentioned Malik, the gate-keeper of the (Hell) Fire, and Ad-Dajjal.
Volume 4, Book 55, Number 647:
Narrated Abu Huraira:
The Prophet said, “I met Moses on the night of my Ascension to heaven.” The Prophet then described him saying, as I think, "He was a tall person with lank hair as if he belonged to the people of the tribe of Shanu’s.’ The Prophet further said, “I met Jesus.” The Prophet described him saying, **“He was one of moderate height and was red-faced **as if he had just come out of a bathroom. I saw Abraham whom I resembled more than any of his children did.”
Volume 4, Book 55, Number 648:
Narrated Ibn Umar:
The Prophet said, “I saw Moses, Jesus and Abraham (on the night of my Ascension to the heavens). **Jesus was of red complexion, curly hair and a broad chest. **Moses was of brown complexion, straight hair and tall stature as if he was from the people of Az-Zutt.”
New Jesus son of Mary (Metaphorically)
quote:
Volume 4, Book 55, Number 649:
Narrated Abdullah:
The Prophet mentioned the Massiah Ad-Dajjal in front of the people saying, Allah is not one eyed while Messsiah, Ad-Dajjal is blind in the right eye and his eye looks like a bulging out grape. While sleeping near the Ka’ba last night, I saw in my dream **a man of brown color the best one can see amongst brown color and his hair was long that it fell between his shoulders. His hair was lank and water was dribbling from his head **and he was placing his hands on the shoulders of two men while circumambulating the Kaba. I asked, ‘Who is this?’ They replied, ‘This is Jesus, son of Mary.’
In short, Holy Prophet (PBUH) has described both old and new Jesus completely differently. So they can not be the same one