You definitely cannot charge any LA as fast as Li.
You may be thinking that you can only charge so fast because of your alternator capacity, therefore it makes no difference - that's not correct either, because LA will push back on the current far far sooner than the Li will. Eg, the Li will continue to accept 100amps up to 95% capacity. While the LA will probably be down to 15amps at 95% capacity so your charge time is considerably longer to reach the same capacity.
If you have a 100ah alternator and a 100ah LFP battery, you can pretty much gaurantee that after 1hour the battery w