Which gospel? Gospel equals good news and there's more than one gospel in the Bible.There "is" not presently two gospels, but during the time of the Acts of the apostles, there were two running side by side (Galatians 2:7 KJV).
Sure.
The gospel of the kingdom
the gospel of God
the gospel of Christ
the gospel of the grace of God
The very requirement(s) for salvation are different!
Those of Matthew, Mark, Luke and John and Hebrews through Revelation's salvation was dependent upon them doing something by faith (James 2:18 KJV):
Repent, and believe the gospel (Mark 1:4 KJV) by baptism of repentance for the remission of sins (Mark 1:4 KJV, Mark 16:16 KJV, Acts 2:38 KJV), keep the commandments (John 14:15 KJV, Matthew 23:2-3 KJV, John 15:5-10 KJV), endure to the end to be saved (Matthew 10:22 KJV), go through the trial of their faith (1 Peter 1:7 KJV), receiving the end of their faith, even the salvation of their souls (1 Peter 1:9 KJV). That salvation is of the grace that "should" come unto them (Acts 15:11 KJV, 1 Peter 1:10 KJV). They look forward that their sins may be blotted out, when the times of refreshing shall come from the presence of the Lord (which is at what many refer to as the second coming of the Lord (Acts 3:19-21 KJV).
The requirement of our salvation today/to be in the church which is His Body is solely based upon the faith of Jesus Christ (Galatians 2:16 KJV) and His finished work on the cross in our place (Romans 4:25 KJV, 1 Corinthians 15:1-4 KJV apart from our works (Romans 6:23 KJV, Ephesians 2:8-9 KJV, Titus 3:4-7 KJV)! To be saved today is to trust the Lord believing the gospel of Christ (1 Corinthians 15:1-4 KJV) which is where the righteousness of God is revealed (Romans 1:16-17 KJV). Those who have trusted the Lord today having believed the gospel of Christ "are saved" presently (1 Corinthians 1:18 KJV, 1 Corinthians 15:2 KJV,Ephesians 2:5 KJV, Ephesians 2:8 KJV). We are baptized BY one Spirit into one Body (not by water for the remission of sins 1 Corinthians 12:13 KJV). We have now received the atonement (Romans 5:11 KJV).