Well.... I have an SB-2 and an L-2500 with single coil option. But, I've never really compared them like you're asking for. They both sound like monsters. But, I don't think any of their pickups are in exactly the same spot. And then, of course, the neck pickup on the L is not a split coil. So, without even directly comparing them that way, I would say no, they don't have exactly the same tone. But, I would say they both share the same MFD aggressiveness. And the L bridge pickup definitely sounds more full than the SB-2 bridge pickup.
If that isn't enough for you, I can possibly do some sample recordings of both, back to back, so you can compare and hear the differences for yourself. They don't have exactly the same strings, though. My SB-2 has tapewounds and my L has TI Jazz Flats. So, similar, but not the same. Oh, and my SB-2 has Master Volume and Tone controls added (and still has individual vols for the two pickups). I think it still sounds the same, with the Master and Tone wide open.
However, I would almost suggest that you avoid even listening to sound clips to compare them. Instead, you need to get an L in your hands to play with. Even if you insist on single coil mode only, the pickup switching combined with the passive tone controls plus the tone changes you can get using the volume knob, I would say no sample recording of an L will be thorough enough to let you really hear all the possibilities. It would require incredible luck for the person doing the recording to hit on the combination that really sounds "right" to you, and missing that would be likely to make you decide an L is not for you, when maybe it would NAIL what you want, if you just spent some time yourself dialing it in.
That is the beauty and the beast of an L-2500 - especially with the single coil option. It is so tonally diverse, it actually puts some players off of the bass because they either don't have the patience to learn it and found the sound they're looking for, or they have some inner "need" to use all the options a bass offers, even though it might be that the bass has 1000 sounds and exactly 1 of those is what the player really wants. If they could ignore the rest of the knobs and switches, they would be happy. But, because they can't, they end up not liking the bass.