The IIA Standards state that conformance with standards related to independence and objectivity is not dependent upon the size of the internal audit activity. All internal audit functions, regardless of their size, must adhere to the principles of independence and objectivity to ensure that their work is unbiased and free from undue influence. This is fundamental to the credibility and reliability of the internal audit activity's work and findings. While small internal audit activities may face unique challenges, such as resource limitations, these challenges do not exempt them from maintaining these core principles.
The IIA's International Standards for the Professional Practice of Internal Auditing (Standards) - Standard
1100 on Independence and Objectivity.

For an internal auditor developing an approach for an audit engagement in a foreign country, it is most important to consider accepted practices in the country that may be illegal elsewhere. This awareness is critical to ensure that the audit respects local laws and regulations while also adhering to the ethical standards required in the auditor's home country. Understanding and navigating the legal and cultural differences can significantly impact the effectiveness and legality of the audit process.References: International auditing standards and guidelines that emphasize the importance of legal and cultural awareness in conducting audits across different jurisdictions.