This is positive.
There's no difference in the evaluation(s) to be performed under IDEA or Section 504, although it does seem that some school districts slack on Section 504 evaluation(s). The evaluation should include areas related to suspected disabilities including but not limited to educational testing, psychiatric evaluation, occupational therapy, auditory processing, medical (diagnostics only), speech-language, etc. The evaluation should be presented in the Report and include recommendations.
One more reason for most parent referrals to be for an IEP -- sds take IEP evaluations more seriously. It happens that children with-all types of disabilities are never evaluated in school. Those with-behavior problems and/or LDs tend to be pushed out in high school (and earlier in some cases).
FYI, Section 504 students are entitled to related services such as physical therapy, occupational therapy, etc., also.
The following explains the major differences in IDEA and Section 504.
http://www.wrightslaw.com/info/sec504.who.protect.htm
Q: Who may be protected under Section 504, but not under IDEA? A student with AIDS? A student with ADD? A student with chronic asthma?
A: Section 504 is a civil rights law. Section 504 protects individuals with disabilities from discrimination. Section 504 ensures that children with disabilities have equal access to an education.
All three students would be protected from discrimination under Section 504. Each of these students may also be eligible for special education and related services under IDEA.
Eligibility for special education and related services under IDEA (and eligibility for protection from discrimination under Section 504) is not disability-specific. This means that one child who has ADD or asthma or AIDS is eligible for special education services under IDEA (which always makes a child eligible under 504) while another child who has ADD or asthma or AIDS is not eligible for services under IDEA, but may be protected from discrimination under Section 504.
These decisions are specific to each child.
If the child has a disability that adversely affects educational performance, the child is eligible for special education services under IDEA. Children who eligible for special education services under IDEA are protected under Section 504 (but the converse is not true).
If the child has a disability that does not adversely affect educational performance, then the child will not be eligible for special education services under IDEA but will usually be entitled to protections under Section 504.
http://www.wrightslaw.com/info/sec504.index.htm is a good overview of 504.