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What’s the difference between the two sentences?

I think, on the given occasion, the two are same and am I right? Thanks for your help.

1: Of the 35 Britons known to have been snatched in the Delta since 2006, only four were taken this year, says the British government.

2: Of the 35 Britons known to be snatched in the Delta since 2006, only four were taken this year, says the British government.
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The inferred meaning is the same, but the second is a bit sloppy. Generally it's more accurate to use the perfect aspect (to have been snatched) when you mention a period of time that extends to the present (since 2006).

CJ
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thanks for your help Emotion: smile I got it!