Sounds to me like this is old two gospel "idea", one gospel for the Jews and different one for the rest.
Do you think its another Gospel they are preaching in Mathew , mark , Luke and John? After all they are not preaching the death , burial and resurrection.
Read luke 18 .
OK this is after they have already been preaching ' the Gospel ( good news ) of the kingdom.
now ask if that's the death, burial and resurrection ( the good news we have to believe)
31¶Then he took
unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished.
32For he shall be delivered unto the Gentiles, and shall be mocked, and spitefully entreated, and spitted on:
33And they shall scourge
him, and put him to death: and the third day he shall rise again.
Well , well ,well . How could they have been preaching something they did not believe and or understand?
Heres their response ;
34¶And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken.