Well, there may be conflict, there may not... it depends.
As venerable Paññāsikhara suggested, it will depend on what you understand the term "paramattha" (sometimes translated as, 'ultimate realities') to mean, and whether you think that is consistent with sunnata.
This PDF explains it well...The Dhamma Theory: Philosophical Cornerstone of the Abhidhamma by Prof. Dr. Y. Karunadasahttp://www.zeh-verlag.de/download/dhammatheory.pdf
I must admit personally to being influenced in this matter by...SN 12.15 - Kaccayanagotta Suttahttp://www.accesstoinsight.org/tipitaka ... .than.html
In particular, this bit.
"By & large, Kaccayana, this world is supported by (takes as its object) a polarity, that of existence & non-existence. But when one sees the origination of the world as it actually is with right discernment, 'non-existence' with reference to the world does not occur to one. When one sees the cessation of the world as it actually is with right discernment, 'existence' with reference to the world does not occur to one."
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)