difference b/w these two sql statements

Hi friends.
can you please explain me the difference in logic for these two statements,because i feel its the same, but i am getting different result sets...please explain me the difference....

statement 1
select 'TrackOnlyUsers', count(t1.company_id), nvl(t3.type,9)
from noah_user_plan t1, csr_routing_stats t3
where t1.plan_component_id = 400
and sysdate between t1.activation_date and t1.expiration_date
and t1.company_id not in (select t2.company_id from noah_user_plan t2
where t2.company_id = t1.company_id
and sysdate between t2.activation_date and t2.expiration_date
and t2.plan_component_id <> 400)

and t1.company_id = t3.company_id(+)
and t1.company_id not in (
select company_id from company_suspend where
suspend_status='SP' and deleted='N'
)
group by t3.type;

statement 2
select 'TrackOnlyUsers', count(t1.company_id), nvl(t3.type,9)
from noah_user_plan t1, csr_routing_stats t3
where t1.plan_component_id = 400
and sysdate between t1.activation_date and t1.expiration_date
and t1.company_id = t3.company_id(+)
and t1.company_id not in (
select company_id from company_suspend where
suspend_status='SP' and deleted='N'
)
group by t3.type;

please help me...

regards
anandkl